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The most common cause for vibration at speed is tire balance. Sometimes a wheel just throws a weight. Have your front tires rechecked. If it only happens under braking it could be dirt in the pads or warped/cheapie rotors. If steering bushings are worn out you should feel a little play and imprecision in the steering at all times.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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